Thought petrov was decent and played some lovely balls, you don't need to skin an opponent every time if you can pass precisely, besides Martin's game is a ll about getting in behind the full back not directly running at them like SWP, or he likes to get to the byline and bend a cross in.
Beckham never took anyone on in his career but he was fairly decent and still can influence a game. Same deal with Martin for me.
Think he is better sticking to the left though.